Method of forming hollow articles



A118 6, 1929 G. RosENQvlsT 1,723,659

V METHOD 0F FORMING HOLLOW ARTICLES 4Filed Nov. 16; 1926 B/ flammea/Mk y BY .A/ 764.4%, /g ZTTORNEY Patented Aug. 6, 1929.

UNITED SKTTIES GUNNAR ROSENQVIST, OF PITTSBURGH, PENNSYLVANIA.

METHOD OFFORMING HOLLOW ARTICLES.

Application led November 16, 1,926. Serial No. 148,627.

This invention relates to a method of forming hollow articles, the object of the invention being to provide a method by means of which such larticles as tubing, radiators, etc. can be formed by galvanoplastic precipitation of' thel metal from which the article is to be. made.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention consists in the novel method which will be more fully described hereinafter and. particularly pointed out in the claims. l

In the drawings accompanying and formin part of this specification.

Iig. 1 isa horizontal sectional view taken on the line 1--1 of Fig. 2 and illustrating my improved method as applied to the f ormation of a single series of tubes forming an integral structure;

Fig. 2 is a transverse sectional view of the structure shown in Fig.V l;

Fig. 3 is a longitudinal section taken on the line 3-3 of Flg. 4. illustrating one of the tubes after it has been opened out;

Fig. 4 is a transverse section taken on the line 4--4 of Fig. 3; I

Fig. 5 is a transverse sectional view simiu lar to Fig. 4, but illustrating the invention applied to the formation of a plurality of series of tubes forming an (integral whole; and Y Fig. 6 is a transverse sectional view illustrating the manner of depositing the lay ers of material to form the article shown 1n Fig. 5. i The same characters of reference designate `the same parts in the different figures of the drawings.

The roved method consists in superimposingr I galvanoplastic precipitation a plurality o layers of the metal from which the article is to be formed, Asaid layers adhering together only at desired points or surfaces, or along certain definite lines, the layers being later separated one from the ot er by mechanical meansvat those portions of the surfaces which have not adhered together.

Referring to the drawings, the method may be carried outfby depositing on a matrix A by rgalvanplastic preclpitation a layer B of metal o any" desired thickness. Certain portions of the exposed upper surface of this layer are then covered with a coating of some material which will prevent adhesion of opposed portions of a superimposed layer'. A second layer D of metal is then deposited over the entire surface of B, whereupon the layers B and D will unite and become an integral structure only along those portions not covered by the coating. As illustrated in Fi s. 1 and 2, the coating is applied at C, so t at the layers B and D unite only along the portions indicated by E. By the use of mechanical means, such as special tools, air or water pressure, the

. layers B and D may then be separated from each other between the united ortions E thereof thus forming a hollow ody comprising a single series of tubular elements as indicated in Figs; 3 and 4. If preferred, the entire surface of the layer B may be coated with the material C and the latter removed at the portions where it is desired that the layers B and D shall unite.

Figs. 5 and 6 illustrate the application of the method to the formation of a somewhat more complicated structure. In this case, a plurality of layers of metal B, D, F, G, H and I are deposited in superimposed relation, each being separated from contiguous layers at portions of their surfaces by coatings C, as shown in Fi 6, and upon forcing the layers apart at tese portions in the manner hereinbefore described a structure comprising a plurality of series of tubular members such as shown in Fig. 5 may be formed.

While I have illustrated herein the useA of a matrix, it will be readily understood that after the deposition of the first layer of metal this layer may have the coating C aplied at both sides thereof and the remainin layers deposited thereon also at both s1 es. l

Having thus described my invention, what I claim is:

1. The method of forming hollow articles which consists in depositing a layer of metal, coverin tions o its surface with a separating coating, depositing a second layer of metal on the partly coated surface, and forcing the layers apart at-the coatedwportions.

2. The method of forming hollow articles which consists in depositing a layer of metal yby galvanoplasticprecipitation, covering said layer at predetermined portions of its .surface vith'a separating coating, depositsaid layer at predetermined poring a second layer of metal on the partly coated surface, at the coated portions, said layers being united at the uncoated portions and each forming one half of the Wall of an integral tubular article. p

3. The method of forming hollow articles which consists in depositing by galvanoplastic precipitation a plurality of successive layers of metal disposed in contiguous relation, the exposed surface of each suc-` and forcing the layers apartl In testimony whereof I have signed my 20 name to this specification.

GUN NAR ROSENQVIST. 

